Reply To: update failed

Either it can’t upload, copy or extract it.
Some of the functions for that can give out true even if it hasn’t worked, but of course there are checks and messages for each possible error. That it happens can have many reasons. File/folder needs higher CHMOD, a server setting, problems with the tmp folder, an incompatibility between the PHP version and the ZipArchive class… Endless.

I’ve never set up a server so I don’t know the normal problems and how to fix them. Either I haven’t worked with one were the problem happens so I can’t help you much.